Monochrome palette
Kelp Mesa
From #276698 ink through #9e682c, #3d7bae, #bb8349 to #5896cb light, Kelp Mesa is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size.
skymonochromefive-stop
#276698
#9e682c
#3d7bae
#bb8349
#5896cb
The generator opens with #276698 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.